21 Now, lest I seem to accuse him without reason, let me make a digression to tell who this Manes is, and in part what he teaches: for all time would fail to describe adequately the whole of his foul teaching. But for help in time of need, store up in your memory what I have said to former hearers, and will repeat to those now present, that they who know not may learn, and they who know may be reminded. Manes is not of Christian origin, God forbid! nor was he like Simon cast out of the Church, neither himself nor the teachers who were before him. For he steals other men's wickedness, and makes their wickedness his own: but how and in what manner you must hear.
Source: Catechetical Lectures (New Advent)